WORKFLOWS: Add some github workflows

.github/workflows/dist_archives.yaml

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+name: Make distribution archives
+
+on:
+  workflow_dispatch:
+    inputs:
+      config-flags:
+        description: 'Configure flags to prepare the source directory'
+        default: ''
+        required: false
+        type: string
+      zip:
+        description: 'Additionally create ZIP archive next to default GZIP'
+        required: false
+        default: false
+        type: boolean
+      artifact-name:
+        description: 'Name of the artifact'
+        required: false
+        default: 'distribution-archives'
+        type: string
+  workflow_call:
+    inputs:
+      config-flags:
+        description: 'Configure flags to prepare the source directory'
+        default: ''
+        required: false
+        type: string
+      zip:
+        description: 'Additionally create ZIP archive next to default GZIP'
+        required: false
+        default: false
+        type: boolean
+      artifact-name:
+        description: 'Name of the artifact'
+        required: false
+        default: 'distribution-archives'
+        type: string
+    outputs:
+      version_number:
+        description: "The Version number of this build"
+        value: ${{ jobs.make_dist.outputs.version_number }}
+
+jobs:
+  make_dist:
+    runs-on: ubuntu-latest
+    # Map the job outputs to step outputs
+    outputs:
+      version_number: ${{ steps.tarball.outputs.version_number }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Install prerequisites
+      run:  |
+        sudo apt-get update
+        sudo apt-get -y install \
+          build-essential \
+          autoconf \
+          automake \
+          gengetopt \
+          libtool
+    - name: Autotools setup
+      run:  |
+        autoreconf -i
+    - name: Configure
+      run: ./configure ${{ inputs.config-flags }}
+    - name: Make tarball
+      id: tarball
+      run:  |
+        make dist-gzip
+        version_number=$(ls RNAcode-*.tar.gz)
+        version_number="${version_number#RNAcode-}"
+        version_number="${version_number%.tar.gz}"
+        echo "version_number=${version_number}" >> "$GITHUB_OUTPUT"
+    - name: Make ZIP
+      if: ${{ inputs.zip }}
+      run:  make dist-zip
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ inputs.artifact-name }}
+        path: |
+          RNAcode-*.tar.gz
+          RNAcode-*.zip
+        retention-days: 3

.github/workflows/dist_check.yaml

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+name: Run distcheck
+
+on:
+  workflow_dispatch:
+    inputs:
+      config-flags:
+        description: 'Configure flags to prepare the source directory'
+        default: ''
+        required: false
+        type: string
+  workflow_call:
+    inputs:
+      config-flags:
+        description: 'Configure flags to prepare the source directory'
+        default: ''
+        required: false
+        type: string
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Install prerequisites
+      run:  |
+        sudo apt-get update
+        sudo apt-get -y install \
+          build-essential \
+          autoconf \
+          automake \
+          gengetopt \
+          libtool
+    - name: Autotools setup
+      run:  |
+        autoreconf -i
+    - name: Configure
+      run: ./configure ${{ inputs.config-flags }}
+    - name: distcheck
+      run:  make distcheck

.github/workflows/pull_request.yaml

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+name: Process Pull Request
+
+on: pull_request
+
+jobs:
+  run-distcheck:
+    uses: ./.github/workflows/dist_check.yaml
+
+

.github/workflows/release.yaml

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+name: Version release
+
+on:
+  push:
+    tags:
+      - 'v*.*'
+
+jobs:
+  run-distcheck:
+    uses: ./.github/workflows/dist_check.yaml
+
+  create-dist-archives:
+    needs: run-distcheck
+    uses: ./.github/workflows/dist_archives.yaml
+    with:
+      zip: true
+      artifact-name: 'dist-archives'
+
+  create-release:
+    needs: [run-distcheck, create-dist-archives]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+    - uses: actions/checkout@v4
+    - name: Download source archives
+      uses: actions/download-artifact@v4
+      with:
+        name: dist-archives
+    - name: Make release
+      uses: ncipollo/release-action@v1
+      with:
+        artifacts: "RNAcode-*.tar.gz,RNAcode-*.zip"
+        name: "RNAcode ${{ needs.create-dist-archive.outputs.version_number }}"